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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 978 (Engine Controls - 4.3L (Introduction)) >> Repair Instructions >> Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the old sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
  1. If reinstalling the old HO2S, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the bank 2 HO2S (1).

    Tighten:  Tighten the sensor to 42 N.m (31 lb ft).

    3. Fig 1: View Of Bank 1 & 2 HO2S
    GM815044Courtesy of GENERAL MOTORS CORP.
  3. Connect the HO2S electrical connector.
  4. Install the CPA retainer.
  5. Install the HO2S from the harness clip.
  6. Install the clip securing the HO2S to the engine harness.
    7. Fig 2: View Of O2 Sensor Harness Routing And Harness Mounting Brackets
    GM664828Courtesy of GENERAL MOTORS CORP.
  7. Lower the vehicle.
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